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How is an "Unknown user" or "No User Available" handled in Central Email?
Is there a "CatchAll" setting somewhere so I can designate all incoming emails that don't have legitimate recipients go to?
Open a gmail or yahoo email up and send a fake user email to your domain and see what happens.
Also and because I am curious on the outcome here, are you hosting your own email servers internally or do you have Office 365 setup with a site relay?